/*******************************************************************************
 * Copyright 2006, 2017 Jerry Huxtable, Martin Davis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * This file was semi-automatically converted from the public-domain USGS PROJ source.
 */
package org.locationtech.proj4j.proj;

import org.locationtech.proj4j.ProjCoordinate;

public class Wagner7Projection extends Projection {

	public ProjCoordinate project(double lplam, double lpphi, ProjCoordinate out) {
		double theta, ct, D;

		theta = Math.asin(out.y = 0.90630778703664996 * Math.sin(lpphi));
		out.x = 2.66723 * (ct = Math.cos(theta)) * Math.sin(lplam /= 3.);
		out.y *= 1.24104 * (D = 1/(Math.sqrt(0.5 * (1 + ct * Math.cos(lplam)))));
		out.x *= D;
		return out;
	}

	/**
	 * Returns true if this projection is equal area
	 */
	public boolean isEqualArea() {
		return true;
	}

	public String toString() {
		return "Wagner VII";
	}

}
